William gentry shelton



W. G. SHELTON.

szwms MACHINE MOTOR.

APPLICATION FILED NOV- 2511919. Reissued Feb. 22 1921.

UNITED STATES WILLIAM oim'rnr snnnron, or NEW YORK, N. Y.

SEWING-MACHIN E MOTOR.

Specification of Reissued Letters Patent. Reissued Feb, 22, 1921,

Original No. 1,247,732, dated November 27, 1917, Serial No. 166,787,filed May 7, 1917. Application for reissue filed November 25,

To all whom it maiy concern:

Be it known that I, WILLIAM GENTRY SHELTON, a citizen'of the UnitedStates of America, residing in'the borough of -Manhattan, city, county,and State of New York,

have invented certain new and useful Im-' provements in Sewing-MachineMotors, of which the following is a specification.

The objectvof this invention is to provide an electric sewing machinemotor continuously rotatable in one direction which is so vation,applied to the driving wheel of a sewing machine, the outline of suchdriving wheel, sewing-machine arm and table being shown in this view;

Fig. 2 is a View showing the motor in ele vation, part' of its framebeing broken away and its pulley applied to the pulley or driving wheelof a sewing machine, the point of application being on the side oppositeto that represented in Fig. 1, and

Fig. 3 is an elevational view of the moto and a portion of the pulley ordriving wheel at substantially right angles to that of Fig. 1, lookingat this from the right-hand side.

Considerable difiiculty has been experienced in sewing-machine motorsheretofore in use owing to the fact that some sewing machines are drivenin one direction-of rotation and some in the other at the oint of toapplication of the electric driver. his has necessitated the use ofreversing switches, or, in some instances, shifting the pulley from oneend of the armature shaft to the other. A motor built according to myimprovement is capable of application, without any change in its workingparts whatsoever,

. to either side of the driving pulley of the sewing machine for thepurpose ofeffecting drive in opposite directions. Certaln of the partsof a sewing machine are shown in outline in the drawings, there being atable a 5 shown supporting a conventional form of head 6 in, which ismounted ahorizontally disposed shaft 7 carrying a-wheel 8. This wheel,as is well known, is called by various Figure 1 shows my improved motorin ele-,

1919. Serial No. 3 10,6405.

names, according to the viewpoint of the one mentioning it; It servesthe purpose, of course, of a fly-wheel, a hand-wheeh, and, in thepresent connection, a driving-wheel. For the purposes of simplicity thiswheel 8 will be referred to as a pulley or driving pulley. The motorcasing 9 is shown piv-- otally mounted upon a standard 10; having a base11 resting upon, and preferably frictionally engaging, the sewingmachine table 5: The pivots 12 are shown connected to the motor casing 9nearer the pulley end than the other end of the casing whereby thegravity of the casing has a tendency to hold this in an upright positionwith the armature shaft 13 1n a substantially vertical position. A.pulley 14 is shown mounted upon the armature shaft 13. This pulley ismade of some suitable material to driv ingly engage the pulley '8 of thesewing machlne. The wheel 8 in most sewing machines is provided wlth arounding contour, and g the pulley is shown concaved to securely engageand conform tothe shape of the member which it engages. It hasheretofore been thought necessary to provide a comparatively'largelow-speed motor for driving a sewing machine by a frictional en-'gagement with the pulley 8. The size of the motor has in some respectscontrolled the point of application of the driving pulley. I havediscovered that a small high speed motor is very eflicient in thisconnection and that, owing to the smallness of the motor, it is possibleto have this'90 located when in use practicall y under the pulley 8 orbetween such pulley and the sewing machine table 5. By this means thetractive engagement takes place at the side of the pulley 8 and themotor automatically slows down to the requirement. of itsuse. Of course,the employment of afoot-com trolled rheostat inconnection with powermotors of various kinds is so. well known that specific illustration anddescription in on the present instance is unnecessary.

The force of engagement between the pulleys 8 and 14 may be provided forby varying the amount of metal in the lower part of the motorcasing, as,for instance,- by 'putlob ting the right amount of metal in the hub' 15at the end of the casing opposite the pulley. A cable 16 leading thecurrent into the motor is also shown entering at the lower, 3 end of thecasing, which also adds to the tendency of the motor to assume anupright posltion. In some instances it may be found desirable to applyspring pressure, a conmotor is as follows: Assuming that the motion ofthe sewing machine in Figs. 1 and 3 of the illustration is in thedirection of the arrow 8 and the motor is built to run as indicated bythe arrow 14 from left to right, then the manner of applying the motoris to place the left-hand side of the motor pulley 14 against theright-hand side of the pulley 8 in Fig. 1. The weight of the variousparts then has a tendency to, bring the pulleys into suflicient drivingengagevment. can, of course, be augmented in various ways.

This weight, as above explained,

. If it is desired to operate the machinewith the motor tl1us,.ap'plied, it is merely necessary to permit the proper amount ofelectric current to enter the motor. If the correct direction ofrotation of the sewing machine is in the direction of the arrow 8", themanner of applying the motor is merely to swing it on its pivots 12 andpress therighthand side-of thepulley 14 against the lefthand side of thepulley 8, see Fig. 2. This, then, with the driver still running in thesame direction, "will deliver the correct rotation to the sewingmachine. In either of theseapplications of the motor it will be seenthat the motor is capable ofoccupying for causing the armature shafttonormally a position substantially beneath the pulley 8."

@ Although but onepracticable embodiment of the invention isillustrated, yet it will be apparent that various changes may be madewithin the scope of the claims without de arting from the spirit of theinvention.

hat I claim is .1. A sewing machine motor comprising a support forresting upon and..-frictionally engaging the table of a sewing machine,an

electric motor, pivotally mounted onsuch support, and means acting uponthe motor assumea substantially vertical position, and

apulley carried by the armature shaft forengagingthe driving pulley ofthe sewing:

machine; p 2. A sewing machine motorcomprising a support for restinguponand frictionall'y engaging the table of a sewing machine, an

electric motor, rotatable fin one'direction; and pivotally-mounted onsuch support, and

vertical position, and a pulley carried by the armature shaft forengaging the driving pulley of a sewing machine.

4:. A sewing machine motor comprising an electric motor rotatable in onedirection, a

support to which the motor is pivotally mounted, the pivotal point beingabove the center of gravity of the electric motor and the parts being soproportioned that the armature shaft normally assumes a verticalposition, and a pulley carried by the armature" shaft for engagingeither side of the driving pulley of a sewing machine for effectingrotation in the desired direction.

5. In a sewing machine motor, the combination with an electric motorprovided with a casing, a support therefor, pivots carried by the motorcasing at a point above its center of gravity and mountedin saidsupport, the armature shaft being adapted to assume a vertical positionincident to gravity, and a pulley mounted upon said armature shaft forengaging the driving pulley of a sewing machine. 6. A sewing machine.motor according to claim'5, having means acting on the motor casing foraugmenting the actionof gravity.

7. In combinationfwith the, sewing machine motor of claim 5, a springacting on the casing for urging the armature shaft toward a verticalposition.

. 8. A sewing machine motor comprising a motor having a driving pulleyand a support, said motor having a pivotal mounting on said support,said driving pulley having its axis at an incline and adapted to swingtoand from'the side of the hand wheel of a sewing machine, andvmeans forpressing of the crown thereof.

pivotally mounted motor, with a driving pulley, and meansv adapted topress said motor around its pivotal axis, in a verti ing wheel of asewing machine on one side 9. A sewing machine motor comprising a'callyinclined position, against the driving I wheel of aysewing machinethe pulle 7 axis? motor .su stan- 1 and, said pivotal axis of the tiallyintersecting.

q I 10. A sewlng machine motor comprising I a pivotally mounted motorwith a driving 1 rection of rotation of said motor.

11. A sewing machine motor comprising a support and a motor pivotallymounted on said support, said motor having a drivingpulley, and beingmovable around said pivotal axis to bring said driving pulley againstone side or the other of the driving wheel of a sewing machine, wherebysaid sewing machine driving wheel may be driven in one direction or theother, as may be required, without reversing the direction of rotationof said motor.

12. A sewing machine motor comprising a support and a motor pivotallymounted on said support, said motor having a drivin pulley, and beingmovable around sai pivotal axis to bring said driving pulley against oneside or the other of the drivin wheel of a sewing machine, whereby saidsewing machine driving wheel may be driven in one direction or theother, as may be required, said support and motor having a combinedweight sufficient to maintainit in frictional contact with the table ofa sewing machine during the running of the motor.

13. A sewing machine motor comprising a support, and a motor, a singlepivotal connection between said motor and support, and means adapted topress said motor around its pivotal axis, in an inclined posi-' tionagainst either side of the driving wheel of a sewing machine, wherebysaid driving wheel may be drivenin one direction or the other withoutreversing thedirection of rotation of said motor.

In witness whereof, I have hereunto signed my name.

WILLIAM GENTRY SHELTON.

